Page 109 - IM_Algebra2_FL Print Sample.pdf

6. Use the spreadsheet to decide whether the sequence 50, 42.1, 34.2, 26.3 is arithmetic or geometric, and nd its common di erence or common ratio.
Student Response
1. Open a blank spreadsheet. In A1, type 10 and enter.
a. A2 shows 13.
b. Each cell shows 3 more than the cell above it. Column A contains 10, 13, 16, 19, . . .
c. Change the value in A1 to 12.
d. Change A2 to =A1-1. Then, re-do the ll down.
2. In B1, type 16 and enter.
a. B1 shows 8.
b. Each cell shows the product of 0.5 and the cell above it. Column B contains 16, 8, 4, 2, . . .
c. Change the value in B1 to 10.
d. Change B2 to =B1*3. Then, re-do the ll down.
3. In column C, starting at C1 and going down, type these terms of a geometric sequence: 700, 70, 7, 0.7, 0.07
a. 0.1
b. It’s the common ratio for the sequence.
c. All cells contain 0.1
4. In column E, starting at E1 and going down, type these terms of an arithmetic sequence: 7, 10.5, 14, 17.5
a. 3.5
b. It’s the common di erence for the sequence.
c. All cells contain 3.5
5. Geometric; 1.5
6. Arithmetic; -7.9
4.3 Plot Some Points
Optional: 15 minutes
In this activity, students learn how to plot points in a graphing calculator by entering data into a table.
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Teacher Guide
Algebra